JP2001169516A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify control systems for controling rotations of two rotors into one system. SOLUTION: A 1st motor 3 with a 1st rotor 9 which is provided inside a 1st stator 7 comprising a plurality of coils, and comprises a pair of salient poles made of magnetic material; and a 2nd motor 5 with a 2nd rotor 15 which is provided inside a 2nd stator 13 comprising the same number of coils as the 1st stator, and comprises a pair of permanent magnets; are provided. Resultant currents I are generated in pairs of coils, connected in series to each other between the coils of the 1st stator 7 and coils of the 2nd stator 13, so as to generate rotating magnetic fields between the respective stators and rotors, and supplied to the 1st and 2nd stators.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine capable of simplifying a control system for controlling rotation of a plurality of rotors into one system.

[0002]

2. Description of the Related Art Conventionally, there has been known a synchronous motor in which two synchronous motors are independently provided, and each of them is controlled individually so as to rotate synchronously.

[0003]

However, in such a synchronous motor, two inverters have to be provided in order to separately and synchronously rotate the two synchronous motors.

[0004] Therefore, when current is supplied from the respective inverters to the two synchronous motors, switching loss of the inverters increases, and furthermore, since two inverters are required, the configuration of the control system becomes large. There was a problem of doing.

[0005] The present invention has been made in view of the above,
An object of the present invention is to provide a rotating electric machine that can simplify a control system for controlling rotation of two rotors into one system.

[0006]

According to the first aspect of the present invention,
In order to solve the above-mentioned problems, a first rotor having a predetermined number of magnetic poles formed of convex magnetic poles, a second rotor having a predetermined number of magnetic poles, a core facing the two rotors, and a A stator composed of a plurality of wound coils; a first control current for generating a rotating magnetic field in the stator that rotates synchronously with the rotation of the first rotor;
A control device for supplying a control current to the coil, which is obtained by combining a second control current for generating a rotating magnetic field in the stator that rotates in synchronization with the rotation of the rotor, to the coil.

According to a second aspect of the present invention, in order to solve the above problem, the magnetic pole of the second rotor is constituted by a permanent magnet.

According to a third aspect of the present invention, in order to solve the above-mentioned problems, the gist of the present invention is that the magnetic pole of the second rotor is constituted by a convex magnetic pole.

According to a fourth aspect of the present invention, the number of magnetic poles of the first rotor is different from the number of magnetic poles of the second rotor.

According to a fifth aspect of the present invention, in order to solve the above problem, the number of the coils constituting the stator is a natural number times the number of magnetic poles of the first rotor and the number of magnetic poles of the second rotor. Is the gist.

According to a sixth aspect of the present invention, in order to solve the above-mentioned problem, the stator has one end face facing the first rotor and the other end face facing the second rotor, and is circumferentially separated from each other. The gist of the present invention includes a plurality of cores separately arranged and a coil wound around each of the cores.

According to a seventh aspect of the present invention, in order to solve the above-mentioned problem, the stator includes a first core facing the first rotor and a plurality of coils wound around the first core. 1 stator, a second core facing the second rotor, and the first core wound around the second core.
It is separated into a second stator composed of the same number of coils as the stator coil, and the gist is that the coil of the first stator and the coil of the second stator are electrically connected in series.

According to an eighth aspect of the present invention, in order to solve the above problems, the control device comprises: a first control current for generating a rotating magnetic field having the same number of magnetic poles as the first rotor in the stator; The gist is to supply a control current obtained by combining a first control current for generating a rotating magnetic field having the same number of magnetic poles of the second rotor to the stator to the coil.

According to a ninth aspect of the present invention, in order to solve the above-mentioned problem, the apparatus further comprises detecting means for detecting a rotational phase of the two rotors, and the control device controls the rotational phase of each rotor detected by the detecting means. The point is to generate the control current in accordance with

[0015]

According to the first aspect of the present invention, first,
The rotor includes a second two rotors, a core that faces the two rotors, and a stator that includes a plurality of coils wound around the cores, and rotates in synchronization with each rotation of the first rotor and the second rotor. By supplying a control current generated by combining the first and second control currents for generating a rotating magnetic field to the stator to the coil, the control system for controlling the rotation of the two rotors is simplified to one system. can do.

According to the present invention, the magnetic pole of the second rotor is constituted by a permanent magnet, but the magnetic pole of the first rotor is constituted by a convex pole of a magnetic material. In addition, deterioration of the magnetic characteristics is prevented. That is, if the magnetic poles of the two rotors are both constituted by permanent magnets,
When the same magnetic poles of the two rotors face each other via the stator, the magnetic flux density in the magnets is reduced and a demagnetizing action is effected, and the magnetic characteristics of the magnets may be degraded. By being formed with the salient poles, even if the magnetic poles of the second rotor are constituted by permanent magnets, the above-described magnet deterioration can be avoided.

According to the third aspect of the present invention, since the magnetic pole of the second rotor is constituted by the convex pole of the magnetic material, the problem of magnet deterioration as described above does not occur.

According to the present invention, the number of magnetic poles of the first rotor is different from the number of magnetic poles of the second rotor, so that the two motors are independently rotated. Can be.

According to the present invention, the number of coils constituting the stator is a natural number times the number of magnetic poles of the first rotor and the number of magnetic poles of the second rotor. A rotating magnetic field can be generated between the stator and the rotor.

According to the present invention, the stator is arranged so that one end face faces the first rotor and the other end face faces the second rotor, and is separated from each other in the circumferential direction. The first and second rotors are shared by the plurality of cores and the coils wound around each of the cores. By supplying current to the coil, 2
A control system for controlling the rotation of one rotor can be simplified to one system.

According to the present invention, the first stator includes a first core facing the first rotor and a plurality of coils wound around the core; A second core facing the rotor and a second stator wound around the core and having the same number of coils as the first stator are separated into coils, and the first stator coil and the second stator coil are separated from each other. Are electrically connected in series, and a control system for controlling the rotation of the two rotors is simplified to one system by supplying the control current generated in combination under the condition to the coil. be able to.

According to the present invention, the first control current for generating a rotating magnetic field having the same number of magnetic poles as the number of magnetic poles of the first rotor in the stator, and the same number of magnetic poles as the number of magnetic poles of the second rotor are provided. By supplying a control current obtained by combining a first control current for generating a rotating magnetic field having a magnetic pole to the stator to the coil, a control system for controlling the rotation of the two rotors is simplified to one system. be able to.

According to the ninth aspect of the present invention, the rotational phase of each rotor is detected, and a composite current is generated according to the detected rotational phase. The current required in phase can be supplied to each stator as a composite current and the two rotors can each be rotated independently.

[0024]

Embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIGS. 1A and 1B
FIG. 2 is a diagram illustrating a configuration of a motor applicable to the rotating electric machine according to the first embodiment of the present invention.

In FIG. 1, a casing 1 includes a first motor 3 having a first stator 7 and a first rotor 9 to form a reluctance motor, a second stator 13 and a second rotor 15.
And a second motor 5 serving as a synchronous motor.

The first stator 7 and the second stator 13
The first and second stators are identical cylindrical stators.
The first rotor 9 and the second rotor 15 are arranged at predetermined intervals inside the second stator 13. The first rotor 9 and the second rotor 15 are provided adjacently on the same axis so as to be rotatable with respect to the casing 1 covering the whole.

The second rotor 15 is formed of four poles (two pole pairs) of permanent magnets, and is configured such that the N pole and the S pole are switched every 90 degrees when rotated mechanically once. The first rotor 9 is made of a magnetic material other than a permanent magnet, an iron core, or the like, having two poles (one pole pair) of half the number of pole pairs of the second rotor 15.

A total of 12 coils 19 and 21 are wound around the cores of the first stator 7 and the second stator 13, respectively, and a 12-phase current having a phase difference of 30 degrees flows. Thus, a rotating magnetic field of one pole pair is generated, and a rotating magnetic field of two pole pairs is generated by flowing a six-phase current having a phase difference of 60 degrees.

FIG. 1B shows a typical connection example of 12 coils. One end 19a of the coil 19 of the first stator 7 is connected to an output terminal of an inverter 29 described later, and the other end 19b of the coil 19 is connected to one end 21a of the coil 21 of the second stator 13 in series via a cable. Further, the other end 21b of the coil 21 is commonly connected to the other ends of the other coils of the second stator 13.

Next, FIG. 2 is a block diagram of an electric circuit as a control system.

An inverter 29 for converting a DC current supplied from a battery 31 to an AC current is provided.
9 to the respective coils 19 of the first stator 7 and the respective coils 21 of the second stator 13.
12 is supplied.

Since the sum of all the instantaneous currents of the composite currents I1 to I12 is zero, the current at the terminal connection point 21b is zero. The inverter 29 is equivalent to an ordinary three-phase bridge-type inverter having 12 phases, and includes a transistor and a diode. The internal circuit of the inverter 29 shown in FIG. 2 shows a typical circuit configuration example. The ON / OFF signal given to each gate (base of the transistor) of the inverter 29 is a PWM signal generated by the control unit 27.

In order to rotate the rotors 9 and 15 synchronously with each other, the first motor 3 and the second motor 5 detect the rotor positions represented by the rotational phases θ 1 and θ 2 of the rotors 9 and 15, respectively. A position sensor 23 and a second position sensor 25 are provided, and pulse signals from these sensors 23 and 25 are input to the control unit 27.

In the control section 27, the position between the first rotor 9 and the first stator 7 and the position between the second rotor 15 and the second stator 13 are determined based on the rotor positions θ1 and θ2 of the first rotor 9 and the second rotor 15, respectively. A PWM signal is generated as a composite current command value such that a rotating magnetic field is generated.

Next, the operation of the control unit 27 of the composite motor according to the first embodiment will be described.

Here, for general description, the number of coils of each of the first stator 7 and the second stator 13 is h, the number of pairs of salient poles of the first rotor 9 is P1, the rotation angle is θ1, and It is assumed that the number of pole pairs of the second rotor 15 is P2, the rotation angle is θ2, the current frequency is ω, and the maximum current value is Im.

First, in order to generate a rotating magnetic field having the number of pole pairs Ps by the h coils forming the stator,

(Equation 1) Is required to flow.

Since the number of pairs of salient poles of the first rotor 9 is P1, the self-inductance L of the coil forming each stator is L1.
Is

(Equation 2) Becomes

The number of flux linkages φ of the coils of each stator by the permanent magnet of the second rotor 15 is as follows:

(Equation 3) Becomes

Here, when the torque τ2 (instantaneous torque) acting on the second rotor 15 is obtained from the equations (1) to (3),

(Equation 4) Becomes

Here, the number h of coils of the stator and the second
The remainder of a multiple (2P2) of the number of poles P2 of the rotor 15 is mod (h, 2P2) = 0, and if the number h of coils of the stator is a multiple of the number of poles of the second rotor 15,

(Equation 5) By setting the power supply frequency ω to be the same as the rotation speed of the second rotor 15, P2 = Ps, that is, by creating a rotating magnetic field Ps equal to the number of pole pairs P2 of the second rotor 15,

(Equation 6) Becomes

If P2 ≠ Ps, the torque τ2
Becomes τ2 = 0. Therefore, the rotating magnetic field Ps generated by the stator coil
A constant torque is generated only when the number of pole pairs P2 is adjusted to the number of pole pairs P2 of the second rotor 15.

When P2 = Ps is not satisfied, in the above equation (5),

(Equation 7) Here, it is assumed that P2 is not equal to Ps, for example, h =
12, if P2 = 4 and Ps = 2,

(Equation 8) Which is zero. Here, n is from 0 to 11.

Next, the torque τ1 generated in the first rotor 9
(Instantaneous torque)

(Equation 9) Becomes Here, mod (h, 2P1) = 0, that is,
If the number h of coils of the starter is a multiple of the number P1 of salient poles,

(Equation 10) And the power supply frequency ω is made equal to the rotation speed, and P1 = P
s, that is, by creating a rotating magnetic field equal to the number of pole pairs P2 of the second rotor 15, the first term of the equation (10) becomes:

[Equation 11] Becomes

If P1 ≠ Ps, then τ1 = 0.

When P1 = Ps is not satisfied, in the above equation (10),

(Equation 12) Here, it is assumed that P2 = Ps is not satisfied, and for example, h = 1
2, P1 = 2, Ps = 4,

(Equation 13) Which is zero. Here, n is from 0 to 11.

From the above, as the composite current I,

[Equation 14] , The torque τ1 generated by the first rotor 9 becomes

(Equation 15) Becomes This indicates the reluctance torque generated in the first rotor 9. Basically, from the composite current I of the equation (10) and the above equation (6), Im is changed to Im1, and β is changed to β1.
It is required if you change to

On the other hand, by flowing the composite current I of the above-mentioned equation (14), the torque τ 2 generated by the second rotor 15 becomes

(Equation 16) Become. This indicates the magnet torque generated in the second rotor 15. Basically, similarly, from the composite current I of the equation (10) and the above equation (4), Im to Im2 and β to β2
It is required if you change to

As described above, the torque of the first rotor 9 can be controlled by using the phase angle β 1 of the first term of the equation (10) representing the composite current I, and the torque of the second rotor 15 is controlled by the phase of the second term. It can be controlled using the angle β2.

When this is applied to the configuration shown in FIG. 1, the number h of coils of the stator, the number P 1 of salient poles of the first rotor 9,
Since the number of pole pairs P2 of the rotor 15 is h = 12, P1 = 1, P2 = 2, the torque τ1 of the first rotor 9 and the second rotor 1
The torque τ2 of No. 5 is as follows: τ1 = 6L2Im12sin2β1 τ2 = 12φmIm2sinβ2

As described above, the first motor 3 having the first rotor 9 provided on the inner periphery of the first stator 7 composed of a plurality of coils and comprising a salient pole pair of a magnetic material has the same number as the first stator 7. A second motor 5 which is provided on the inner periphery of the second stator 13 made of a coil and has a second rotor 15 made of a pair of permanent magnets, and is connected in series from the coil of the first stator 7 to the coil of the second stator 13 The control unit 27 generates a composite current I so that a rotating magnetic field is generated between each stator and the rotor for the coil pair connected to A control system for controlling the rotation of the two motors can be simplified to one system.

The control unit 27 generates the composite current I such that a rotating magnetic field having the same number of pole pairs as the number of salient poles and the number of permanent magnets of the first and second rotors is generated. Since the current I is supplied from the inverter 29 to the first and second stators, the control system for controlling the rotation of the two motors can be simplified to one system.

Also, by setting the number of coils of the first and second stators to be a natural number times the number of pairs of salient poles and the number of pairs of permanent magnet logarithms of the first and second rotors, the number of coils of each stator and rotor can be reduced. A rotating magnetic field can be generated between them.

By setting the ratio of the number of pairs of salient poles of the first rotor to the number of pairs of permanent magnets of the second rotor to a value other than 1, the two motors can be independently rotated. .

The rotational phases of the first and second rotors are detected, and a composite current is generated in accordance with the detected rotational phases. The current can be supplied to each stator as a composite current, and the two motors can each be rotated independently.

As a result, when energy is taken into account, for example, when one rotor acts as a generator and the other acts as a motor, the energy supplied or regenerated from the inverter is the power generation and drive energy. It is sufficient to supply the difference, which can contribute to a reduction in the capacity of the inverter.

Further, since the two rotors are driven by using one inverter, it is possible to suppress switching loss and snubber loss and other inherent losses of the inverter.

(Second Embodiment) FIGS. 3A and 3B
FIG. 9 is a diagram showing a configuration of a motor applicable to a rotating electric machine according to a second embodiment of the present invention.

In this embodiment, the second motor 5 shown in FIG.
Instead, as shown in FIG. 3, another type of second motor 53 is provided.

The second rotor 57 constituting the second motor 53
Has a salient polarity without a permanent magnet having two salient pole pairs, and the second stator 13 is the same as that of the first embodiment.

The principle of generating torque in the second rotor 57 of the second motor 53 is expressed by the equation (2) for obtaining the self-inductance as described above.

As described above, the first motor 3 having the first rotor 9 provided on the inner periphery of the first stator 7 composed of a plurality of coils and having a salient pole pair made of a magnetic material has the same number as the first stator 7. A second motor 53 provided on the inner periphery of the second stator 13 formed of a coil and having a second rotor 57 formed of a pair of magnetic poles; For the coil pair connected in series with the coil, the control unit 27 generates a composite current so that a rotating magnetic field is generated between each stator and the rotor, and the inverter 29 supplies current to the first and second stators. Thus, the control system for controlling the rotations of the two motors can be simplified to one system.

By setting the logarithm ratio of the salient poles of the first and second rotors to a value other than 1, the two motors can be independently rotated.

(Third Embodiment) FIGS. 4A, 4B,
(C) is a figure which shows the structure of the motor applicable to the rotary electric machine which concerns on 3rd Embodiment of this invention.

In this motor, a first motor is constituted by the stator 100 and the first rotor 9, and the stator 100 and the second
The second motor is constituted by the rotor 15.

The stator 100 includes a stator core 101 having teeth 101b formed at twelve locations inside a ring-shaped back core 101a, and a coil 103 (only one is shown in the figure) wound around each of the teeth 101b. , And the inner peripheral end face of the teeth portion 101b faces both the first rotor 9 and the second rotor 15, respectively.

In this motor, the same composite current as that of the first embodiment is supplied to the coil 103, so that the first rotor 9
And the rotation of the second rotor 15 can be controlled independently of each other.

(Fourth Embodiment) FIGS. 5A, 5B,
(C) is a figure which shows the structure of the motor applicable to the rotary electric machine which concerns on 4th Embodiment of this invention.

In this motor, a first motor is constituted by the stator 110 and the first rotor 9, and the stator 110 and the second
The second motor is constituted by the rotor 15.

The stator 110 has 12 divided cores 11.
And a coil 1 wound around each of the divided cores 111a.
12 (only one portion is shown in the figure), and the end face on one axial side of the divided core 111a is the first rotor 9
And the end face on the other axial side is the second rotor 15.
And confront.

The magnetic flux generated by the current flowing through the coil 112 flows through the divided core 111a as shown by the arrow in the figure, and is transmitted to the second rotor 15 side. Therefore, even in such a structure, the rotation of the first rotor 9 and the second rotor 15 can be controlled independently by supplying the same composite current to the coil 112 as in the first embodiment.

When the magnetic poles of the first rotor 9 are formed of, for example, permanent magnets, the magnetic flux density in the magnets decreases when the same magnetic poles of the two rotors 9 and 15 face each other via the split core 111a. The demagnetization function works, and the magnetic characteristics of the magnet may deteriorate. However, in this embodiment, since the magnetic poles of the first rotor 9 are configured by the convex poles of the magnetic material, the above-described magnet deterioration can be avoided.

[Brief description of the drawings]

FIG. 1 is a side sectional view (a) and a top sectional view (b) showing a configuration of a motor applicable to a rotating electric machine according to a first embodiment of the present invention.

FIG. 2 is a block diagram of an electric circuit including a control system.

FIG. 3 is a side sectional view (a) and a top sectional view (b) showing a configuration of a motor applicable to a rotating electric machine according to a second embodiment of the present invention.

FIG. 4 is a side sectional view (a), a front view (b), and a rear view (c) showing a configuration of a motor applicable to a rotating electric machine according to a third embodiment of the present invention.

5A is a side sectional view, FIG. 5B is a front view, and FIG. 5B is a rear view of a motor applicable to a rotating electric machine according to a fourth embodiment of the present invention.

[Explanation of symbols]

 7 1st stator 9 1st rotor 13 2nd stator 15 2nd rotor 19,21 coil 23 1st position sensor 25 2nd position sensor 27 control part 29 inverter 31 battery 100,110 stator 101,111 stator core 103,112 coil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H572 BB02 BB10 CC02 DD05 EE03 FF08 HA08 HB07 HC01 HC08 LL32 5H619 BB01 BB02 BB06 BB15 BB24 PP01 PP02 PP04 PP08 PP14 5H621 AA03 BB01 BB02 BB07 GA04 GB10 HH01

Claims (9)

[Claims] 1. A first rotor having a predetermined number of magnetic poles formed by a convex pole of a magnetic material, a second rotor having a predetermined number of magnetic poles, a core facing the two rotors, and winding around the core A first control current that causes the stator to generate a rotating magnetic field that rotates synchronously with the rotation of the first rotor, and a rotating magnetic field that rotates synchronously with the rotation of the second rotor. A control device that supplies a control current obtained by combining a second control current generated in the stator to the coil. 2. The rotating electric machine according to claim 1, wherein the magnetic pole of the second rotor is constituted by a permanent magnet. 3. The rotating electric machine according to claim 1, wherein the magnetic pole of the second rotor is constituted by a convex pole of a magnetic material. 4. The rotating electric machine according to claim 1, wherein the number of magnetic poles of the first rotor is different from the number of magnetic poles of the second rotor. 5. The method according to claim 1, wherein the number of coils constituting the stator is a natural number times the number of magnetic poles of the first rotor and the number of magnetic poles of the second rotor. The rotating electric machine as described. 6. The stator according to claim 1, wherein one end face of the stator is the first end face.
It is characterized by comprising a plurality of cores facing the rotor and having the other end face facing the second rotor and separated from each other in the circumferential direction, and a coil wound around each of the cores. The rotating electric machine according to claim 1. 7. A first stator comprising a first core facing the first rotor and a plurality of coils wound around the first core, and a second stator facing the second rotor. A core and a second stator wound around the second core and composed of the same number of coils as the first stator coil are separated from each other, and the first stator coil and the second stator coil are separated from each other. The rotating electric machine according to any one of claims 1 to 6, wherein the rotating electric machine is electrically connected in series. 8. The control device has a first control current for causing the stator to generate a rotating magnetic field having the same number of magnetic poles as the number of magnetic poles of the first rotor, and the same number of magnetic poles as the number of magnetic poles of the second rotor. The rotating electric machine according to claim 1, wherein a control current obtained by combining a first control current that generates a rotating magnetic field in the stator is supplied to the coil. 9. The apparatus according to claim 1, further comprising: a detection unit configured to detect a rotation phase of the two rotors, wherein the control device generates the control current in accordance with a rotation phase of each rotor detected by the detection unit. The rotating electric machine according to claim 1.